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How to Use a Cellphone Directory to Trace Numbers. If you're tired of getting annoying
calls from telemarketers and others, consider using a cellphone directory service to trace
the numbers and identify unknown callers. You will need Internet access Smartphone reverse
directory app and reverse directory service fees. Step 1. Enter the phone number into
a search engine. The caller may have entered personal info online. Step 2. Try using reverse
directory smartphone apps that allow you to enter a number into a database and get caller
names and addresses. Directory search results should include the phone number owner's name,
address, wireless carrier, and even the names of previous owners. Step 3. Find online reverse
directory services like WhitePages.com. Most of these services charge a fee, but reputable
services offer a free search to determine if the cell number is available in their database.
Step 4. Consider using directory services that offer info beyond an unknown caller's
name and address, such as a criminal background checks, for safety reasons. Once you have
an idea who's calling, you'll know what steps to take next. Did you know In 1940, Motorola
developed the Handie-Talkie, a portable 2-way radio forerunner of the cellphone, used during
World War II.